It's like Uke has to choose either
a) broken elbow OR
b) forward projection

In short, udekimenage is not a 'NICE' throw. It's you roll or you get injured. Compare this to iriminage or shihonage where the throw is inexorable and cannot be resisted once balance is broken but does not require any joint breaking for it to work. Here udekimenage has an element of 'u may be injured so you better roll'.

Thoughts on this?

Interesting thought.

I don't know that there is a category based on level of effectiveness of the techniques. Because my sensei told me that all the technique are very dangerous and very applicable in specific situation, where we can only learn to detect what situation for what technique by time and experience , because all the decision and the process will be happened in split second.

I also have always been told repeatedly by my sensei's that :
1. all of the technique should be done in "special way" to respect and protect our training partners who are willing to help our growth. Example : don't push on uke's elbow, aware when pulling uke's hand in shihonage, etc.
2. Everybody especially the beginners have to work hard to improve their ukemi and breakfall. Because the goal of ukemi and breakfall techniques is self protection. Especially when technique is done very fast and the projection of the throw is very hard (in advance level), uke will get severely injured when they can't response well with perfect ukemi/breakfall technique. (before this, once i thought the breakfall and ukemi technique are intended for show or demonstration )

But i will discuss this with my senpai's and my sensei's at the dojo, thank you for bringing up this discussion. It's really interesting. Ow btw, maybe i need to tell you that i am just a beginner in aikido , but really interested to learn many things especially from the discussions in this forum, so.. i am really sorry if i have something wrong on what i am saying here. Thanks.